VulnerabilityPublished 19 Jul 2026Updated 21 Oct 2026

CVE-2026-63999: Linux kernel · ethtool: rss: fix indir_table and hkey leak on get_rxfh failure

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 266297692f97008ca48bc311775c087c59bd7fe3 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 266297692f97008ca48bc311775c087c59bd7fe3, 323faef6366349f57d4ad67d318a0c8906e360b3, 80d95d92f828cfcace955d673637d944178b435f +8

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.6.88 <6.6.160 >=6.12.24 <6.12.114 >=5.15.181 <5.16 >=6.1.135 <6.2 >=6.13.12 <6.14 >=6.14.3 <6.15	Fixed in 266297692f97008ca48bc311775c087c59bd7fe3 323faef6366349f57d4ad67d318a0c8906e360b3 80d95d92f828cfcace955d673637d944178b435f 33d05c22d6f227c5ae171c46df2f6f8bf48047ea 14dbf22c397b799b3a80f63fc90c2fc0585bbeb3 6.15 6.14 6.12.114 6.6.160 6.2 5.16
LinuxLinux	Affected =6.15	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: ethtool: rss: fix indir_table and hkey leak on get_rxfh failure rss_prepare_get() allocates the indirection table and hash key buffer via rss_get_data_alloc(), then calls ops->get_rxfh() to populate them. If get_rxfh() fails, the function returns an error without freeing the allocation.

References

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